ATmega16 datasheet(233/315 Pages) ATMEL

233 / 315 page

233

ATmega16(L)

2466E–AVR–10/02

Note:

Incorrect setting of the switches in Figure 123 will make signal contention and may damage the part. There are several input

choices to the S&H circuitry on the negative input of the output comparator in Figure 123. Make sure only one path is selected

from either one ADC pin, Bandgap reference source, or Ground.

MUXEN_4

Input

Input Mux bit 4

MUXEN_3

Input

Input Mux bit 3

MUXEN_2

Input

Input Mux bit 2

MUXEN_1

Input

Input Mux bit 1

MUXEN_0

Input

Input Mux bit 0

NEGSEL_2

Input

Input Mux for negative input for

differential signal, bit 2

NEGSEL_1

Input

Input Mux for negative input for

differential signal, bit 1

NEGSEL_0

Input

Input Mux for negative input for

differential signal, bit 0

PASSEN

Input

Enable pass-gate of gain stages.

PRECH

Input

Precharge output latch of

comparator. (Active low)

SCTEST

Input

Switch-cap TEST enable. Output

from x10 gain stage send out to

Port Pin having ADC_4

Input

Output of gain stages will settle

faster if this signal is high first two

ACLK periods after AMPEN goes

high.

VCCREN

Input

Selects Vcc as the ACC reference

voltage.

Table 91. Boundary-scan Signals for the ADC (Continued)

Signal

Name

Direction as Seen

from the ADC

Description

Recommended

Input when Not

in Use

Output Values when Recommended

Inputs are used, and CPU is not

Using the ADC

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